There are 13 words that start with 'pesti'.
| pestier | pestiest |
| pesticide | pestilent |
| pesticides | pestilence |
| pestiferous | pestilences |
| pestilently | pestilential |
| pestiferously | pestilentially |
| pestiferousness | |
Note: These 13 words that start with 'pesti' are found from the USA & Canada version of the tournament Scrabble word list.